WO2014084296A1 - 色素増感太陽電池 - Google Patents
色素増感太陽電池 Download PDFInfo
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- WO2014084296A1 WO2014084296A1 PCT/JP2013/082004 JP2013082004W WO2014084296A1 WO 2014084296 A1 WO2014084296 A1 WO 2014084296A1 JP 2013082004 W JP2013082004 W JP 2013082004W WO 2014084296 A1 WO2014084296 A1 WO 2014084296A1
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- dye
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- -1 iodine, iodine ions Chemical class 0.000 claims abstract description 89
- 150000001875 compounds Chemical class 0.000 claims abstract description 61
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- 239000004065 semiconductor Substances 0.000 claims abstract description 60
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- 238000012546 transfer Methods 0.000 claims abstract description 28
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 26
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 24
- 239000011630 iodine Substances 0.000 claims abstract description 23
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 22
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 125000001424 substituent group Chemical group 0.000 claims description 72
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- 239000000565 sealant Substances 0.000 claims description 43
- 125000000217 alkyl group Chemical group 0.000 claims description 37
- 150000001450 anions Chemical class 0.000 claims description 25
- 125000000623 heterocyclic group Chemical group 0.000 claims description 25
- 125000003545 alkoxy group Chemical group 0.000 claims description 24
- 125000003118 aryl group Chemical group 0.000 claims description 24
- 125000005843 halogen group Chemical group 0.000 claims description 24
- 125000002252 acyl group Chemical group 0.000 claims description 21
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 21
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 14
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- 239000002253 acid Substances 0.000 description 6
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- NRHMKIHPTBHXPF-TUJRSCDTSA-M sodium cholate Chemical compound [Na+].C([C@H]1C[C@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC([O-])=O)C)[C@@]2(C)[C@@H](O)C1 NRHMKIHPTBHXPF-TUJRSCDTSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003637 steroidlike Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- DPKBAXPHAYBPRL-UHFFFAOYSA-M tetrabutylazanium;iodide Chemical compound [I-].CCCC[N+](CCCC)(CCCC)CCCC DPKBAXPHAYBPRL-UHFFFAOYSA-M 0.000 description 1
- CCIYPTIBRAUPLQ-UHFFFAOYSA-M tetrabutylphosphanium;iodide Chemical compound [I-].CCCC[P+](CCCC)(CCCC)CCCC CCIYPTIBRAUPLQ-UHFFFAOYSA-M 0.000 description 1
- GKXDJYKZFZVASJ-UHFFFAOYSA-M tetrapropylazanium;iodide Chemical compound [I-].CCC[N+](CCC)(CCC)CCC GKXDJYKZFZVASJ-UHFFFAOYSA-M 0.000 description 1
- 150000003567 thiocyanates Chemical class 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- ILWCNQXVCCMVCY-UHFFFAOYSA-N trimethyl(2-propanoylsulfanylethyl)azanium Chemical compound CCC(=O)SCC[N+](C)(C)C ILWCNQXVCCMVCY-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C327/00—Thiocarboxylic acids
- C07C327/20—Esters of monothiocarboxylic acids
- C07C327/30—Esters of monothiocarboxylic acids having sulfur atoms of esterified thiocarboxyl groups bound to carbon atoms of hydrocarbon radicals substituted by nitrogen atoms, not being part of nitro or nitroso groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
- C09B23/10—The polymethine chain containing an even number of >CH- groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
- C09B23/10—The polymethine chain containing an even number of >CH- groups
- C09B23/105—The polymethine chain containing an even number of >CH- groups two >CH- groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B57/00—Other synthetic dyes of known constitution
- C09B57/008—Triarylamine dyes containing no other chromophores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2004—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
- H01G9/2013—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte the electrolyte comprising ionic liquids, e.g. alkyl imidazolium iodide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2022—Light-sensitive devices characterized by he counter electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2068—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells
- H01G9/2077—Sealing arrangements, e.g. to prevent the leakage of the electrolyte
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2027—Light-sensitive devices comprising an oxide semiconductor electrode
- H01G9/2031—Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/655—Aromatic compounds comprising a hetero atom comprising only sulfur as heteroatom
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/542—Dye sensitized solar cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Definitions
- the present invention relates to a dye-sensitized solar cell capable of realizing excellent photoelectric conversion efficiency and durability.
- the structure is a substrate comprising a semiconductor-containing layer composed of oxide semiconductor fine particles sensitized with a dye, provided on a transparent conductive substrate serving as one electrode, and a counter electrode in which platinum or the like is disposed so as to face it.
- Non-patent Document 1 a type in which a charge transfer layer (electrolyte solution containing a redox substance) is sandwiched between them.
- a charge transfer layer electrophilic solution containing a redox substance
- the dye-sensitized solar cell has reached the same performance as an amorphous silicon solar cell (Non-patent Document 1).
- Improvement of durability especially for long-term use is one of the important issues to be overcome.
- further improvements in photoelectric conversion efficiency and durability of the dye-sensitized solar cell are desired.
- Non-Patent Document 2 The sensitizing dyes of dye-sensitized solar cells are roughly classified into two systems: ruthenium-based dyes and non-ruthenium-based dyes.
- Non-Patent Document 2 non-ruthenium dyes with few resource restrictions and a wide range of molecular designs have been actively developed.
- an electrode containing platinum is often used for the counter electrode of the dye-sensitized solar cell.
- an electrolytic solution containing an iodine-based redox pair having a well-balanced performance is generally used for the charge transfer layer between the semiconductor-containing layer and the counter electrode.
- the dye-sensitized solar cell obtained by these combinations has good initial photoelectric conversion efficiency, it has a problem that it is inferior in long-term stability due to high corrosivity of iodine-based redox.
- Patent Document 1 proposes a method of preparing a counter electrode by performing a surface treatment of a platinum substrate with a compound containing sulfur, and a method of adding a sulfur-containing substance to an electrolytic solution. ing.
- the surface treatment of the platinum substrate has a large process load, and the treatment effect may not last for a long time.
- sulfur-containing substances having a low oxidation number are generally oxidized by iodine-based redox, the addition of such a compound to the electrolytic solution has a high possibility of greatly impairing the stability of the electrolytic solution.
- the patent makes no mention of these issues.
- the durability evaluation in the examples is not at a level where it is estimated that the battery has long-term stability. Therefore, the method disclosed in the patent is still an incomplete technology.
- examples of adding a sulfur-based material to the electrolyte include electrolytes to which thiocyanate ions are added (Non-patent Document 3, Patent Document 2, etc.), and aminotriazoles having alkylthio groups and benzylthio groups. Examples thereof include an added electrolytic solution (Patent Document 3) and an electrolytic solution added with sulfolane (Patent Document 4).
- Patent Document 3 an added electrolytic solution
- Patent Document 4 an electrolytic solution added with sulfolane
- the conventional dye-sensitized solar cell including all of the electrolyte including the non-ruthenium-based dye, the platinum electrode, and the iodine-based redox as a constituent member has long been expected to be put into practical use. It still has many inconveniences regarding durability.
- An object of the present invention is to provide a dye-sensitized solar cell using a non-ruthenium dye capable of realizing excellent photoelectric conversion efficiency and durability.
- the present inventors have intensively studied to solve the above-mentioned problems.
- a compound using a non-ruthenium dye as the sensitizing dye, platinum as the counter electrode, iodine and iodine ions in the charge transfer layer, and both a thioester bond and a positively charged nitrogen atom in the molecule It has been found that a dye-sensitized solar cell using an electrolytic solution containing is excellent in both photoelectric conversion efficiency and durability.
- a dye-sensitized solar cell which is an electrolytic solution containing a compound having both positively charged nitrogen atoms.
- a compound having both a thioester bond and a positively charged nitrogen atom in the molecule is represented by the following formula (1): (In the formula, R1, R2, R3, R4, R5 and R6 are each independently a halogen atom, alkoxy group, ester group, acyl group, amino group, amide group, alkyl group, alkenyl group, alkynyl group, aryl group.
- a cyano group, an isocyano group, a nitro group, a nitroso group, a hydroxyl group, a phosphate ester group, a sulfinyl group, and a sulfonyl group which may have one or more substituents having 1 to 10 carbon atoms Aliphatic hydrocarbon residue, halogen atom, alkoxy group, ester group, acyl group, amino group, amide group, alkyl group, alkenyl group, alkynyl group, aryl group, cyano group, isocyano group, nitro group, nitroso group, hydroxyl Having one or more substituents selected from the group consisting of a group, a phosphate group, a sulfinyl group and a sulfonyl group Aromatic hydrocarbon residue, halogen atom, alkoxy group, ester group, acyl group, amino group, amide group, alkyl group, alkenyl group,
- the dye-sensitized solar cell according to item [1], wherein the semiconductor of the semiconductor-containing layer is fine particle titanium oxide or fine particle composite titanium oxide. [7].
- the non-ruthenium organic dye is represented by the following formula (2) (In the formula, A 1 and A 2 are each independently a carboxyl group, a cyano group, an alkoxycarbonyl group, an acyl group, a nitro group, a cyclic hydrocarbon residue, a heterocyclic residue, an amino group, a hydroxyl group, hydrogen.
- each A 1 and each A 2 each independently represent the above-mentioned group which may be the same or different, and when there are a plurality of A 1 or A 1, When there are a plurality of 1 , A 2 or A 2 , any two of A 2 and X may combine to form a ring.
- a 1 in the formula (2) is a cyano group or a carboxyl group.
- X in formula (2) is a (poly) ethenyl group or (poly) thiophenyl group having a triphenylamine derivative.
- the dye-sensitized solar cell of the present invention is excellent in initial conversion efficiency and durability. In particular, the heat resistance is good. According to this dye-sensitized solar cell, high durability is achieved even when a non-ruthenium organic dye, which is generally difficult to ensure durability, is used as a sensitizing dye and platinum is used for the counter electrode. It is possible to realize.
- the present invention is described in detail below.
- the dye-sensitized solar cell of the present invention includes a first conductive support having a semiconductor-containing layer sensitized with a dye, and a counter provided at a position where the semiconductor-containing layer and the counter electrode face each other at a predetermined interval.
- Second conductive support having electrodes, charge transfer layer sandwiched between gaps of first and second conductive support, and first and second conductive supports for sealing charge transfer layer
- a dye-sensitized solar cell including a sealant provided in the periphery of the organic dye, wherein the dye is a non-ruthenium organic dye, the counter electrode has platinum, and the charge transfer layer is iodine, It is characterized by being an electrolytic solution containing iodine ions and a compound having both a thioester bond and a positively charged nitrogen atom in the molecule.
- the dye-sensitized solar cell of the present invention has a first conductive support having a semiconductor-containing layer sensitized with a dye.
- This first conductive support is generally supported by a substrate formed of glass or the like.
- the conductive support include conductive materials typified by FTO (fluorine-doped tin oxide), ATO (antimony-doped tin oxide), and ITO (indium-doped tin oxide), glass, plastic, polymer film, quartz, silicon, and the like.
- a thin film on the surface of the substrate is used. The thickness of the substrate is usually 0.01 to 10 mm.
- a light transmissive substrate is used for at least one of the first and second conductive supports.
- the resistance value of the conductive support is usually 1000 ⁇ / cm 2 or less, preferably 100 ⁇ / cm 2 or less.
- metal chalcogenide fine particles are preferable.
- transition metal oxides such as Ti, Zn, Sn, Nb, W, In, Zr, Y, La, and Ta, Al oxide, Si oxide, StTiO 3 , CaTiO 3 , and BaTiO 3 . 3 or the like perovskite oxide.
- TiO 2 , ZnO, and SnO 2 are particularly preferable.
- These oxides may be used in combination, and a preferred example is a SnO 2 —ZnO mixed system.
- a mixed system they may be mixed in the form of fine particles, mixed in a slurry or paste state described below, or the components may be used in layers.
- the primary particle size of the oxide semiconductor used here is usually 1 to 200 nm, preferably 1 to 50 nm.
- an oxide semiconductor for example, titanium and magnesium, calcium, zirconium, strontium, etc. described in International Publication No. WO2006 / 080384 are disclosed.
- a composite oxide semiconductor manufactured by mixing non-titanium metal or the like can also be used.
- the sensitizing dye that can be used in the dye-sensitized solar cell of the present invention is not particularly limited as long as it is a non-ruthenium organic dye having an action of sensitizing light absorption in combination with semiconductor fine particles constituting the semiconductor-containing layer.
- a non-ruthenium organic dye a single dye may be used, or several kinds of dyes may be mixed and used in an arbitrary ratio.
- a wide absorption wavelength can be used by mixing dyes having different absorption wavelength regions, so that a solar cell with high conversion efficiency can be obtained.
- non-ruthenium-based organic dyes include cyanine-based, merocyanine-based, oxonol-based, triphenylmethane-based, acrylic acid-based dyes described in International Publication No. WO2002 / 011213, and International Publication No. WO2006 / 126538 Methine dyes such as the pyrazolone methine dyes described in 1., xanthene, azo, anthraquinone, perylene, indigo, acridine, quinone, coumarin, phenylxanthene, phthalocyanine whose central metal is not ruthenium And porphyrin-based dyes whose central metal is not ruthenium.
- Japanese Patent No. 3731752 Japanese Patent Application Laid-Open No. 2002-334729, Japanese Patent Application Laid-Open No. 2002-512729, Japanese Patent Application Publication No. 2003-007358, Japanese Patent Application Laid-Open No. 2003-015146, Japanese Patent Application Laid-Open No. 2003-05547.
- JP, 2003-086257 JP 2003-115333, JP 2003-132965, JP 2003-142172, JP 2003-151649, JP 2003-157915, JP 2003-282165 A, JP 2004-014175 A, JP 2004-022222, JP 2004-022387 A, JP 2004-227825 A, JP 2005-005026 A, JP 2005-019130, JP 2 Nos.
- the dye represented by the following formula (2) is particularly preferably used in the dye-sensitized solar cell of the present invention.
- the dye represented by the formula (2) is used in the meaning including both the free acid represented by the formula (2) and a salt thereof unless otherwise specified.
- the salt of the dye represented by the formula (2) include a metal salt in which the carboxylic acid moiety in the formula (2) is an alkali metal or alkaline earth metal such as lithium, sodium, potassium, magnesium or calcium. Or a compound that is a quaternary ammonium salt with tetramethylammonium, tetrabutylammonium, pyridinium, imidazolium, or the like.
- a 1 and A 2 are each independently a carboxyl group, cyano group, alkoxycarbonyl group, acyl group, nitro group, cyclic hydrocarbon residue, heterocyclic residue, amino group, hydroxyl group, hydrogen
- An atom, a halogen atom or an alkyl group is represented.
- each A 1 and each A 2 each independently represent the same group as described above, which may be the same or different.
- Examples of the alkyl group included in the alkoxycarbonyl group represented by A 1 and A 2 in Formula (2) include a saturated or unsaturated linear, branched or cyclic alkyl group which may have a substituent. .
- linear or branched alkyl group an alkyl group having 1 to 36 carbon atoms is preferable, and a saturated linear alkyl group having 1 to 20 carbon atoms is more preferable.
- the cyclic group include a cycloalkyl group having 3 to 8 carbon atoms.
- the acyl group represented by A 1 and A 2 in Formula (2) include an alkylcarbonyl group having 1 to 10 carbon atoms, an arylcarbonyl group, etc., preferably an alkylcarbonyl group having 1 to 4 carbon atoms, specifically Examples include acetyl group and propionyl group.
- the cyclic hydrocarbon residue represented by A 1 and A 2 in formula (2) means a group obtained by removing one hydrogen atom from a cyclic hydrocarbon.
- the cyclic hydrocarbon include a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, indene ring, azulene ring, fluorene ring, cyclohexane ring, cyclopentane ring, cyclohexene ring, cyclopentene ring, cyclohexadiene ring, And cyclopentadiene ring.
- the cyclic hydrocarbon residue represented by A 1 and A 2 may have a substituent.
- substituents examples include an alkyl group, an aryl group, a cyano group, an isocyano group, a thiocyanate group, an isothiocyanato group, a nitro group.
- substituents include an alkyl group, an aryl group, a cyano group, an isocyano group, a thiocyanate group, an isothiocyanato group, a nitro group.
- substituent examples include an alkyl group, an aryl group, a cyano group, an isocyano group, a thiocyanate group, an isothiocyanato group, a nitro group.
- alkyl group here, the same thing as the alkyl group which the above-mentioned alkoxycarbonyl group has is mentioned.
- the acyl group include the same groups as described above, and examples of the aryl group include a group obtained by removing a hydrogen atom from the aromatic ring described in the section of the cyclic hydrocarbon residue.
- the aryl group may further have a substituent, and examples of the substituent include the same substituents that the above-described cyclic hydrocarbon residue may have.
- the halogen atom include atoms such as chlorine, bromine and iodine.
- the phosphoric acid ester group include phosphoric acid (having 1 to 4 carbon atoms) alkyl ester groups.
- Examples of the substituted or unsubstituted mercapto group include a mercapto group and an alkyl mercapto group.
- Examples of the substituted or unsubstituted amino group include an amino group, a mono- or dialkylamino group, a mono- or diaromatic amino group, and the like. Specific examples include mono or dimethylamino group, mono or diethylamino group, mono or dipropylamino group, mono or diphenylamino group, and mono or dibenzylamino group.
- Examples of the substituted or unsubstituted amide group include an amide group, an alkylamide group, and an aromatic amide group.
- alkoxy group examples include an alkoxy group having 1 to 10 carbon atoms.
- alkoxyalkyl group examples include (alkoxy having 1 to 10) alkoxy (having 1 to 4 carbon) alkyl.
- alkoxycarbonyl group examples include an alkoxycarbonyl group having 1 to 10 carbon atoms.
- Acid groups such as carboxyl group, sulfo group, and phosphoric acid group include metal salts such as lithium, sodium, potassium, magnesium, and calcium, and quaternary ammonium salts such as tetramethylammonium, tetrabutylammonium, pyridinium, and imidazolium. Such a salt may be formed.
- the heterocyclic residue represented by A 1 and A 2 in Formula (2) means a group obtained by removing one hydrogen atom from a heterocyclic compound.
- the heterocyclic compound include a pyridine ring, pyrazine ring, pyrimidine ring, pyrazole ring, pyrazolidine ring, piperidine ring, thiazolidine ring, oxazolidine ring, pyran ring, chromene ring, pyrrole ring, benzimidazole ring, imidazoline ring, imidazoline ring.
- Lysine ring imidazole ring, pyrazole ring, triazole ring, triazine ring, diazole ring, morpholine ring, indoline ring, thiophene ring, bithiophene ring, terthiophene ring, furan ring, oxazole ring, thiazine ring, thiazole ring, indole ring, benzo Examples include thiazole ring, naphthothiazole ring, benzoxazole ring, naphthoxazole ring, indolenine ring, benzoindolenin ring, pyrazine ring, quinoline ring, quinazoline ring, and carbazole ring.
- the heterocyclic residue may have a substituent, and examples of the substituent include the same substituents that the above-described cyclic hydrocarbon residue may have.
- Preferred examples of the heterocyclic residue represented by A 1 and A 2 include a pyridine ring, a pyrazine ring, a piperidine ring, a morpholine ring, an indoline ring, a thiophene ring, a furan ring, an oxazole ring, a thiazole ring, an indole ring, and a benzothiazole. And a group obtained by removing one hydrogen atom from a heterocyclic compound such as a ring, a benzoxazole ring, a pyrazine ring, or a quinoline ring.
- the amino group represented by A 1 and A 2 in Formula (2) may have a substituent.
- the amino group having a substituent include a mono- or dialkylamino group, a mono- or diaromatic amino group, and a monoalkyl monoaromatic amino group.
- the alkyl group possessed by the alkylamino group includes the alkoxycarbonyl group described above. The same thing as the alkyl group which has is mentioned.
- Examples of the aromatic that the aromatic amino group has are the same as those of the above-described cyclic hydrocarbon residue.
- amino group having a substituent examples include a mono- or dimethylamino group, a mono- or diethylamino group, a mono- or dipropylamino group, a mono- or diphenylamino group, and a mono- or dibenzylamino group.
- halogen atom represented by A 1 and A 2 in Formula (2) examples include the same ones as described above.
- alkyl group represented by A 1 and A 2 in Formula (2) include the same alkyl groups as the above-described alkoxycarbonyl group.
- the alkyl group may have a substituent.
- substituent that the alkyl group may have include an aryl group, a halogen atom, and an alkoxy group.
- the aryl group and halogen atom here are the same as those described above, and the alkyl group that the alkoxy group has is the same as the alkyl group that the alkoxycarbonyl group has.
- both A 1 and A 2 may be bonded to form a ring.
- any two of them may be bonded to form a ring.
- any of A 1 and the one of A 2 is not limited particularly either binding, usually adjacent A 1 and A 2 or two adjacent of A 1 between or two adjacent A 2 A ring is formed with each other.
- the ring may have a substituent. Examples of the substituent in the case of having a substituent include the same substituents that the above-described cyclic hydrocarbon residue may have.
- Examples of the ring formed by combining any two of A 1 and A 2 or a plurality of A 1 and a plurality of A 2 include an unsaturated hydrocarbon ring or a heterocyclic ring.
- Unsaturated hydrocarbon rings include benzene, naphthalene, anthracene, phenanthrene, pyrene, indene, azulene, fluorene, cyclobutene, cyclopentene, cyclohexene, cyclohexadiene, cyclopentadiene, etc. Can be mentioned.
- Heterocycles include pyridine ring, pyrazine ring, indoline ring, thiophene ring, furan ring, pyran ring, oxazole ring, thiazole ring, indole ring, benzothiazole ring, benzoxazole ring, pyrazine ring, quinoline ring, carbazole ring, benzopyran A ring etc. are mentioned. Of these, preferred examples include a cyclobutene ring, a cyclopentene ring, a cyclohexene ring, and a pyran ring. Further, when A 1 or A 2 has a carbonyl group or a thionyl group, a cyclic ketone or a cyclic thioketone may be formed.
- a 1 and A 2 include independently a carboxyl group, cyano group, alkoxycarbonyl group, acyl group, hydroxyl group, hydrogen atom, halogen atom, and alkyl group. More preferably, a carboxyl group, a cyano group, a hydrogen atom, a halogen atom, and an alkyl group are mentioned. Of the halogen atoms, a chlorine atom, a bromine atom, and an iodine atom are preferable.
- Equation (2) A 1 that bind to the same carbon atom to the carboxyl group are specified in the (specified has been closest A 1 to the carboxyl groups) is particularly preferably a carboxyl group or a cyano group.
- M in the formula (2) represents an integer of 1 to 6.
- X represents an aromatic hydrocarbon residue, a heterocyclic residue or an amino group.
- the aromatic hydrocarbon residue means a group obtained by removing one hydrogen atom from an aromatic hydrocarbon.
- examples of the aromatic hydrocarbon residue include groups in which one hydrogen atom has been removed from an aromatic hydrocarbon such as a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, indene ring, azulene ring, and fluorene ring. It is done.
- These aromatic hydrocarbon residues usually have an aromatic ring having 6 to 16 carbon atoms (such as an aromatic ring and a condensed ring containing an aromatic ring). Any of these may have a substituent.
- heterocyclic residue represented by X in Formula (2) examples include a group in which one hydrogen atom has been removed from a heterocyclic compound.
- the heterocyclic compound include pyridine ring, pyrazine ring, pyrimidine ring, pyrazole ring, pyrazolidine ring, thiazolidine ring, oxazolidine ring, pyran ring, chromene ring, pyrrole ring, benzimidazole ring, imidazoline ring, imidazolidine ring, Imidazole ring, pyrazole ring, triazole ring, triazine ring, diazole ring, morpholine ring, indoline ring, thiophene ring, bithiophene ring, terthiophene ring, furan ring, oxazole ring, thiazine ring, thiazole ring, indole ring, benzothiazole ring, Examples of
- Each of these rings may be ring-increased or hydrogenated, and may have a substituent.
- the heterocyclic ring may be quaternized and may have a counter ion.
- the counter ion is not particularly limited and may be a general anion. Specific examples include fluoride ion, chloride ion, bromide ion, iodide ion, perchlorate ion, hydroxide ion, methyl sulfate ion, toluenesulfonate anion, tetrafluoroborate anion, hexafluorophosphonate anion.
- Bromide ion, iodide ion, perchlorate ion, tetrafluoroborate anion, hexafluorophosphonate anion, toluenesulfonate anion, trifluoromethanesulfonate anion, and bis (trifluoromethanesulfonyl) imide anion are preferred.
- the amino group represented by X in Formula (2) may have a substituent.
- amino group which may have a substituent examples include an amino group, a diphenylamino group, a monophenylamino group, a dialkylamino group, a monoalkylamino group, an alkylphenylamino group, an alkoxyamino group, an acylamino group ( Examples thereof include a benzoylamino group and an acetylamino group. Examples of the alkyl group, alkoxy group, acyl group and the like of these amino groups are the same as those described above.
- X may be bonded to A 1 or A 2 to form a ring, and the formed ring may have a substituent.
- the ring formed by combining X with A 1 or A 2 include, for example, a benzene ring, naphthalene ring, indene ring, pyridine ring, pyrazine ring, pyrimidine ring, quinoline ring, thiophene ring, indolenine ring, and benzoindolenine.
- Examples of the group include the same substituents on the cyclic hydrocarbon described in the above section A 1 or A 2 , and a carbonyl group, a thiocarbonyl group, and the like.
- Preferred as a substituent on the above aromatic hydrocarbon residue or heterocyclic residue in X, and a substituent on the ring formed from two of X, A 1 and A 2 are a substituent.
- the amino group which may have a substituent is a mono or dialkyl substituted amino group, a monoalkyl monoaryl substituted amino group, a diaryl substituted amino group, a mono or divinyl substituted amino group, a mono or diallyl substituted amino group A mono- or dibutadienyl-substituted amino group, a mono- or distyryl-substituted amino group, and the like.
- a dialkyl-substituted amino group and a diaryl-substituted amino group are preferable.
- alkyl group which may have a substituent examples include an aryl-substituted alkyl group, a halogen atom-substituted alkyl group, and an alkoxy-substituted alkyl group.
- alkoxy group which may have a substituent examples include an alkoxy-substituted alkoxy group, a halogen-substituted alkoxy group, and an aryl-substituted alkoxy group.
- X include an ethenyl group derivative having a triphenylamine derivative at the terminal, a butadienyl group derivative, a hexatrienyl group derivative, a thiophenyl group derivative, a bithiophenyl group derivative, a terthiophenyl group derivative, and the like. Any of these derivatives may have a substituent.
- the substituent may be as described above as the substituent when the aromatic hydrocarbon residue or heterocyclic residue in X has a substituent.
- X is particularly preferably a (poly) ethenyl group or (poly) thiophenyl group having a triphenylamine derivative.
- the dye represented by the formula (2) can take a structural isomer such as a cis isomer or a trans isomer. Any structural isomer is not particularly limited, and can be used favorably as a photosensitizing dye.
- sensitizing dyes include, for example, International Publication No. WO2002 / 011213, Japanese Patent Application Laid-Open No. 2003-171146, Japanese Patent Application Laid-Open No. 2003-282165, Japanese Patent Application Publication No. WO2004 / 082061, and Japanese Patent Application Laid-Open No. 2006. Examples thereof include dyes described in JP-A No. 134649, JP-A 2006-079898, International Publication Nos. WO 2007/100033, JP-A 2007-149570, and the like.
- the dye-sensitized solar cell of the present invention has a second conductive support having a counter electrode.
- the second conductive support includes platinum that acts as a counter electrode on the surface of the same conductive support as that used for the first conductive support and catalytically acts on the reduction reaction of the redox electrolyte as a counter electrode. Or a metal fine particle containing platinum or a metal fine particle precursor containing platinum applied and fired.
- the dye-sensitized solar cell of the present invention has, as a charge transfer layer, an electrolytic solution containing iodine, iodine ions, and a compound having both a thioester bond and a positively charged nitrogen atom in the molecule.
- an electrolytic solution containing iodine, iodine ions a compound having both a thioester bond and a positively charged nitrogen atom in the molecule.
- the compound has at least one thioester bond and at least one positively charged nitrogen atom in one molecule. Any structure of the compound can be used in the dye-sensitized solar cell of the present invention.
- the thioester bond is a structure obtained by dehydration condensation of a carboxylic acid and a thiol, and can be represented by a chemical formula of R—CO—S—R ′.
- the positively charged nitrogen atom is a nitrogen atom having four covalent bonds, specifically, a quaternary ammonium cation, an iminium cation, and pyridinium, imidazolium, pyrrolidinium, pyrrolium, pyrazolium. And those on which nitrogen on the heterocyclic ring such as oxazolium is cationic.
- the positively charged nitrogen atom may have any counter ion.
- examples of counterions include haloniums, oxoanions, thiocyanates, borates, imides, sulfonates, and metal complex ions such as aluminum, chromium, silver, zinc, and iron.
- a compound represented by the following formula (1) is more preferably used in the dye-sensitized solar cell of the present invention. .
- R 1, R 2, R 3, R 4, R 5 and R 6 each independently have an aliphatic hydrocarbon residue having 10 or less carbon atoms and a substituent which may have a substituent. Represents an aromatic hydrocarbon residue which may be substituted, a heterocyclic residue which may have a substituent, or a hydrogen atom.
- n is 2 or more and a plurality of R5 and R6 are present, each R5 and each R6 independently represents the same or different groups described above.
- the aliphatic hydrocarbon residue having 1 to 10 carbon atoms represented by R1 to R6 means a residue obtained by removing one hydrogen atom from an aliphatic hydrocarbon having 1 to 10 carbon atoms.
- the aliphatic hydrocarbon residue may be linear, branched or cyclic, and may be any of saturated aliphatic hydrocarbon and unsaturated aliphatic hydrocarbon.
- the aliphatic hydrocarbon residue having 1 to 10 carbon atoms is, for example, a halogen atom, alkoxy group, ester group, acyl group, amino group, amide group, alkyl group, alkenyl group, alkynyl group, aryl group, cyano group, A substituent selected from the group consisting of a group, an isocyano group, a nitro group, a nitroso group, a hydroxyl group, a phosphate ester group, a sulfinyl group, and a sulfonyl group.
- the substitution position and the number of substitutions of the substituent are not particularly limited. These may have a plurality of the same substituents or may have a plurality of different substituents.
- the aromatic hydrocarbon residue represented by R1 to R6 means a residue obtained by removing one hydrogen atom from an aromatic hydrocarbon.
- the aromatic hydrocarbon include a benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, pyrene ring, indene ring, azulene ring, and fluorene ring. Each of these rings may be increased.
- the aromatic hydrocarbon residue may be, for example, a halogen atom, alkoxy group, ester group, acyl group, amino group, amide group, alkyl group, alkenyl group, alkynyl group, aryl group, cyano group, isocyano group, nitro group
- the group may have a substituent selected from the group consisting of a group, a nitroso group, a hydroxyl group, a phosphate ester group, a sulfinyl group, and a sulfonyl group.
- the substitution position and the number of substitutions of the substituent are not particularly limited. These may have a plurality of the same substituents or may have a plurality of different substituents.
- the heterocyclic residue represented by R1 to R6 means a residue obtained by removing one hydrogen atom from a heterocyclic compound.
- the heterocyclic compound include pyrrolidine ring, oxolane ring, thiolane ring, pyrrole ring, furan ring, thiophene ring, piperidine ring, oxane ring, thiane ring, pyridine ring, imidazole ring, pyrazole ring, oxazole ring, thiazole.
- Ring imidazoline ring, pyrazine ring, morpholine ring, thiazine ring, indole ring, isoindole ring, benzimidazole ring, purine ring, quinoline ring, isoquinoline ring, quinoxaline ring, cinnoline ring, pteridine ring, chromene ring, isochromene ring, acridine Ring, xanthene ring, carbazole ring and the like. Each of these rings may be increased or hydrogenated.
- the heterocyclic residue includes, for example, a halogen atom, an alkoxy group, an ester group, an acyl group, an amino group, an amide group, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a cyano group, an isocyano group, a nitro group, It may have a substituent selected from the group consisting of a nitroso group, a hydroxyl group, a phosphate ester group, a sulfinyl group, and a sulfonyl group.
- the substitution position and the number of substitutions of the substituent are not particularly limited. These may have a plurality of the same substituents or may have a plurality of different substituents.
- any two members selected from R1, R2, R3, R4, R5 and R6 may be combined to form a ring.
- n is 2 or more and there are a plurality of R5 and R6, a ring may be formed by R5 or R6.
- the ring that may be formed may be any of a saturated hydrocarbon ring, an unsaturated hydrocarbon ring, a saturated heterocyclic ring, and an unsaturated heterocyclic ring.
- the ring that may be formed may have an arbitrary number of substituents at arbitrary positions.
- Examples of the ring that may be formed include cyclohexane ring, cyclopentane ring, cyclohexene ring, cyclopentene ring, cyclohexadiene ring, cyclopentadiene ring, lactone ring, lactam ring, cyclic ketone, benzene ring, naphthalene ring, anthracene ring, Phenanthrene ring, pyrene ring, indene ring, azulene ring, fluorene ring, pyrrolidine ring, oxolane ring, thiolane ring, pyrrole ring, furan ring, thiophene ring, piperidine ring, oxane ring, thiane ring, pyridine ring, imidazole ring, pyrazole ring , Oxazole ring, thiazole ring, imidazoline ring, pyrazine
- Each of these rings may be increased or hydrogenated.
- substituents that may have include, for example, a halogen atom, alkoxy group, ester group, acyl group, amino group, amide group, alkyl group, alkenyl group, alkynyl group, aryl group, cyano group, isocyano group, nitro group, Examples thereof include a nitroso group, a hydroxyl group, a phosphate ester group, a sulfinyl group, and a sulfonyl group.
- R1, R2, R3, R4, R5 and R6 include aliphatic hydrocarbon residues having 1 to 6 carbon atoms, phenyl group, naphthalenyl group, benzyl group, pyridyl group, pyrrole group, thiophenyl group, furanyl group.
- Oxolanyl group, oxanyl group, and hydrogen atoms in these substituents are alkyl groups, aryl groups, alkenyl groups, alkynyl groups, alkoxy groups, ester groups, acyl groups, amino groups, amide groups, halogen atoms, cyano groups And the like, a hydrogen atom, and the like.
- Y ⁇ represents a monovalent anion serving as a counter ion of the nitrogen cation.
- Y ⁇ is not particularly limited as long as it is a monovalent anion that can stably exist in an iodine electrolyte.
- An anion having a low basicity is preferred.
- Preferred examples of the anion include fluoride ion, chloride ion, bromide ion, iodide ion, perchlorate ion, hydroxide ion, methyl sulfate ion, toluenesulfonate anion, tetrafluoroborate anion, hexafluorophosphate.
- N in the formula (1) represents an integer of 1 to 6.
- n is preferably an integer of 1 to 4, more preferably an integer of 1 to 3.
- R 1, R 2, R 3 and R 4 are each an aliphatic hydrocarbon residue having 1 to 6 carbon atoms, a phenyl group, a naphthalenyl group, a benzyl group, a pyridyl group as described above.
- pyrrole group thiophenyl group, furanyl group, oxolanyl group, oxanyl group, and hydrogen atoms in these substituents are alkyl groups, alkenyl groups, alkynyl groups, aryl groups, alkoxy groups, ester groups, acyl groups, amino groups It is preferably a substituent substituted with a group, an amide group, a halogen atom, a cyano group or the like, a hydrogen atom, or the like.
- a hydrogen atom in a methyl group, an ethyl group, a propyl group, a butyl group, a phenyl group, a benzyl group, a thiophenyl group, a furanyl group, and a substituent thereof is an alkoxy group, an ester group, an acyl group, an amide group, or a halogen atom. It is more preferably a substituent substituted with any one.
- Y ⁇ represents a fluoride ion, chloride ion, bromide ion, iodide ion, perchlorate ion, hydroxide ion, methyl sulfate as described above.
- An imide anion, (N-trifluoromethanesulfonyl-N-pentafluoroethanesulfonyl) imide anion, and the like are preferable.
- acetylthiocholine, propionylthiocholine, butyrylthiocholine, benzoylthiocholine chloride, bromide, and iodide are most preferable.
- the compound having both a thioester bond and a positively charged nitrogen atom in the molecule in the dye-sensitized solar cell of the present invention may be used alone or in combination of two or more. These may be commercially available products or may be synthesized independently. A compound having a high purity is more preferable, and a compound having a high solubility in an electrolyte solvent is more preferable.
- the concentration of these compounds in the electrolytic solution is usually 0.01 to 2M, preferably 0.02 to 1M, more preferably 0.03 to 0.5M, and particularly preferably 0.05 to 0.3M.
- the electrolyte solution possessed by the dye-sensitized solar cell of the present invention usually contains a compound having iodine ions as a counter ion that can release iodine ions in the electrolyte solution.
- the compound having iodine ion as a counter ion is not particularly limited as long as it is a compound that can provide iodine ion in the electrolytic solution. Those having a high degree of dissociation of iodine ions are preferred.
- Preferred examples of the compound having iodine ions as counter ions include metal halide salts such as lithium iodide, sodium iodide, potassium iodide, cesium iodide; or trimethylammonium iodide, tetrapropylammonium iodide, tetra Ammonium iodides such as butylammonium iodide; imidazolium iodide, 1,3-dimethylimidazolium iodide, 1-ethyl-3-methylimidazolium iodide, 1-methyl-3-propylimidazolium iodide, 1-butyl-3-methylimidazolium iodide, 1-hexyl-3-methylimidazolium iodide, 1,2-dimethyl-3-propylimidazolium iodide, 1,2-dimethyl-3-butylimidazolium iodide I
- Pyrrolium iodides such as 1-propyl-2-methylpyrazolium iodide
- phosphonium iodides such as tetrabutylphosphonium iodide.
- lithium iodide lithium iodide, sodium iodide, potassium iodide, trimethylammonium iodide, tetrabutylammonium iodide, 1,3-dimethylimidazolium iodide, 1-ethyl-3 More preferred are -methylimidazolium iodide, 1-methyl-3-propylimidazolium iodide, 1-butyl-3-methylimidazolium iodide, 1,2-dimethyl-3-propylimidazolium iodide, and the like.
- a compound having iodine ion as a counter ion may be used alone or in combination of two or more in the electrolyte solution of the dye-sensitized solar cell of the present invention.
- the concentration of these compounds in the electrolytic solution is usually 0.01 to 10M, preferably 0.02 to 5M, more preferably 0.03 to 3M, and particularly preferably 0.05 to 2M.
- An electrochemically inert solvent may be used in combination with the electrolyte solution of the dye-sensitized solar cell of the present invention.
- the solvent that can be used in combination may be either an organic solvent or an ionic liquid, or a mixture of both.
- Organic solvents that can be used in combination include acetonitrile, butyronitrile, valeronitrile, hexanenitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, methoxyacetonitrile, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, diethylene glycol dimethyl ether, tri Ethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,2-dimethoxyethane, ⁇ -butyrolactone, diethyl ether, diethyl carbonate, dimethyl carbonate, dimethylformamide, dimethyl sulfoxide, 1,3-dioxolane, methyl formate, 2-methyltetrahydrofuran, 3-methyl-oxazolidine-2-one, Horan, tetrahydrofuran, methyl isopropyl sulfone, and the like as a preferable example.
- acetonitrile, valeronitrile, hexanenitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, methoxyacetonitrile, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, 1,2-dimethoxyethane, ⁇ -butyrolactone, sulfolane, methyl Isopropyl sulfone and the like are more preferable.
- Acetonitrile, valeronitrile, hexanenitrile, 3-methoxypropionitrile, methoxyacetonitrile, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, 1,2-dimethoxyethane, sulfolane, methyl isopropyl sulfone and the like are particularly preferable.
- ionic liquid that can be used in combination
- a compound that is liquid at room temperature is preferable.
- ionic liquids include cations such as imidazole cation, pyrrolidinium cation, pyridinium cation, pyrrolium cation, pyrazolium cation, and phosphonium cation, and fluoride ions, chloride ions, bromide ions, and iodides.
- These solvents may be used alone or in combination of two or more. When two or more types are used in combination, the ratio can be arbitrarily selected.
- the electrolytic solution used in the dye-sensitized solar cell of the present invention may contain a nitrogen-containing compound, other additives, and the like as necessary.
- the nitrogen-containing compound that can be used, other additives, and the like are not particularly limited, and the addition amount may be appropriately selected according to the purpose. It has the effect of improving the transport efficiency of the redox couple in the electrolyte, the effect of promoting the valence injection from the dye to the oxide semiconductor, the effect of preventing the reverse electron transfer from the oxide semiconductor, etc. It is preferable to add those that increase the durability of the dye-sensitized solar cell by improving the stability of the electrolytic solution.
- the sealing agent of the dye-sensitized solar cell of the present invention is used for the purpose of laminating the first and second conductive supports and sealing the electrolytic solution used in the charge transfer layer.
- the sealing agent is not particularly limited as long as it fulfills the above purpose.
- Specific sealants include epoxy resin sealants, acrylate resin sealants, silicone resin sealants, polyisobutylene resin sealants, ionomer resin sealants, (modified) olefin resin sealants, etc. It can be illustrated.
- an epoxy resin-based sealing agent having strong adhesive force and excellent solvent resistance and iodine resistance is preferably used.
- any of a thermosetting type, an ultraviolet curable type, and a photothermal combination type sealing agent can be used as the epoxy resin-based sealant.
- a sealant that can be applied to a screen printing method and a dispensing method and is excellent in adhesion after curing, heat resistance, moisture resistance, solvent resistance, light resistance, gas barrier properties, and the like is preferable.
- the epoxy resin contained in the epoxy resin-based sealing agent is not particularly limited as long as it is an epoxy resin having at least two epoxy groups in one molecule.
- epoxy resins include novolak type epoxy resins, bisphenol type epoxy resins, biphenyl type epoxy resins, triphenylmethane type epoxy resins, hydantoin type epoxy resins, isocyanurate type epoxy resins, aliphatic chain epoxy resins, and bifunctional phenols.
- trisphenol methane novolac type epoxy resin and bisphenol A type epoxy resin are preferred. These may be used alone or in combination of two or more.
- the epoxy resin as described above is useful for adjusting the viscosity of the sealant.
- the sealing agent using these epoxy resins enables a substrate to be superposed at room temperature when forming the dye-sensitized solar cell of the present invention, and facilitates gap formation.
- the composition of the epoxy resin-based sealant is not particularly limited. For example, if it is a thermosetting sealant, an epoxy resin and a thermosetting agent are included. As an ultraviolet curable sealant, an epoxy resin and a photopolymerization initiator are included. As the inclusion and photothermal combination curing type sealing agent, those containing an epoxy resin, a thermosetting agent and a photoreaction initiator are generally used. Either composition may contain further additives.
- thermosetting agent type sealants include other thermosetting resins, reaction accelerators, fillers, coupling agents, solvents, stress relaxation agents, viscosity modifiers, pigments, leveling agents, antifoaming agents, spacers, etc. You may contain as needed.
- UV curable sealants include other UV curable resins, photosensitizers, ion catchers, fillers, coupling agents, solvents, stress relaxation agents, viscosity modifiers, pigments, leveling agents, antifoaming agents, spacers, etc. May be contained as necessary.
- Photothermal combination curable sealants are other thermosetting resins, other ultraviolet curable resins, reaction accelerators, photosensitizers, ion catchers, fillers, coupling agents, solvents, stress relaxation agents, viscosity modifiers. , Pigments, leveling agents, antifoaming agents, spacers and the like may be contained as necessary. Among these, a thermosetting epoxy resin sealant is preferably used.
- thermosetting epoxy resin-based sealant containing phenols, polyphenols, bisphenols, novolacs, amines, guanamines, imidazoles, hydrazides, acid anhydrides and the like as thermosetting agents is more preferable.
- thermosetting epoxy resin-based sealants containing novolacs and hydrazides are particularly preferred.
- Thermosetting epoxy resin-based sealants containing phenol novolacs, aromatic hydrazides, and aliphatic hydrazides having 6 or more carbon atoms are most preferred.
- These thermosetting agents may be used independently and may use 2 or more types together.
- the epoxy resin-based sealant as described above is excellent in adhesiveness, moisture resistance, solvent resistance, and the like. Therefore, the durability of the dye-sensitized solar cell of the present invention can be particularly improved.
- the epoxy resin-based sealant examples include Japanese Patent Application Laid-Open No. 2002-368236, International Publication No. 2004/075333, International Publication No. WO2007 / 046499, International Publication No. WO2007 / 007671, International Application Patent No. PCT / JP2011 / 061166. No. (International Publication WO2011 / 145551) and the like.
- the sealing agents described in JP-A No. 2002-368236 and International Application Patent No. PCT / JP2011 / 061166 International Publication WO2011 / 145551 are particularly preferable.
- a thin film of oxide semiconductor fine particles is a method of directly forming oxide semiconductor fine particles on a conductive support by spray spraying or the like, and forming a thin film of semiconductor fine particles.
- the slurry is obtained by dispersing secondary agglomerated oxide semiconductor fine particles in a dispersion medium by an ordinary method so that the average primary particle diameter is 1 to 200 nm.
- the dispersion medium for dispersing the slurry is not particularly limited as long as the semiconductor fine particles can be dispersed.
- water alcohol such as ethanol, ketone such as acetone or acetylacetone, hydrocarbon such as hexane, or the like is used. These may be used as a mixture. Use of water is preferable from the viewpoint of reducing the change in viscosity of the slurry.
- a dispersion stabilizer can be used in combination for the purpose of stabilizing the dispersion state of the oxide semiconductor fine particles.
- the dispersion stabilizer that can be used include acids such as acetic acid, hydrochloric acid and nitric acid, and organic solvents such as acetylacetone, acrylic acid, polyethylene glycol and polyvinyl alcohol.
- the conductive support coated with the slurry may be fired.
- the firing temperature is usually 100 ° C. or higher, preferably 200 ° C. or higher. And an upper limit is generally below melting
- the firing time is not particularly limited but is preferably within 4 hours.
- the thickness of the thin film on the conductive support is usually 1 to 200 ⁇ m, preferably 1 to 50 ⁇ m.
- the thin film of oxide semiconductor fine particles may be subjected to secondary treatment.
- the performance of the thin film of semiconductor fine particles can be improved by immersing the thin film together with the conductive support directly in a solution of the same metal alkoxide, chloride, nitride or sulfide as the semiconductor and drying or refiring. It can also be improved.
- the metal alkoxide include titanium ethoxide, titanium isopropoxide, titanium t-butoxide, n-dibutyl-diacetyltin and the like.
- an alcohol solution is preferably used.
- the chloride include titanium tetrachloride, tin tetrachloride, and zinc chloride. In this case, an aqueous solution is preferably used.
- the oxide semiconductor thin film thus obtained is composed of fine particles of an oxide semiconductor.
- the solvent that can be used to dissolve or disperse the sensitizing dye include methanol, ethanol, acetonitrile, acetone, dimethyl sulfoxide, dimethylformamide, n-propanol, i-propanol, t-butanol, tetrahydrofuran, and the like. Is mentioned. These solvents may be used alone, or two or more kinds may be mixed and used at an arbitrary ratio.
- the concentration of the sensitizing dye in the solution or dispersion is usually 1 ⁇ 10 ⁇ 6 to 1M, preferably 1 ⁇ 10 ⁇ 5 to 1 ⁇ 10 ⁇ 1 M.
- dye is obtained by immersing the electroconductive support body in which the semiconductor content layer was provided in the solution or dispersion liquid of the sensitizing dye.
- each dye in the case of using a mixture of dyes is not particularly limited, but generally it is preferable to use each dye at least about 10 mol% or more.
- the total concentration of the dye in the solution may be the same as when only one kind is supported.
- the solvent used for each dye may be the same or different.
- inclusion compounds may be added to the dye solution, or the dye may be dissolved or dispersed after the inclusion compound is previously dissolved in a solvent. These inclusion compounds can be used in combination of two or more. In this case, the ratio of a plurality of inclusion compounds can be arbitrarily selected.
- the semiconductor-containing layer may be treated with an amine compound such as 4-t-butylpyridine, pyridine, 4-methylpyridine, or triethylamine, or an acid such as formic acid, acetic acid, or propionic acid.
- This treatment method includes, for example, a method of immersing a conductive support provided with a semiconductor-containing layer carrying a sensitizing dye in an ethanol solution to which an amine compound or an acid is added, or providing a semiconductor-containing layer carrying a sensitizing dye.
- a method in which an amine compound or an acid is directly brought into contact with the conductive support thus obtained and washed and dried with an organic solvent, water, or the like after a certain time is employed.
- a conductive support (first conductive support) having a semiconductor-containing layer sensitized with the dye obtained as described above and a conductive support (second conductive) having a counter electrode.
- a sealant to which a spacer (gap control material) is added is dispenser, screen printing machine, ink jet printing machine, etc. leaving the injection port of the charge transfer layer around the conductive surface of one of the conductive supports. Apply in the shape of a weir. Thereafter, when the sealant contains a solvent, the solvent is evaporated by heating with, for example, a hot air dryer.
- the other conductive support is overlapped so that the conductive surfaces of the first and second conductive supports face each other, and the sealant is cured by heating and / or ultraviolet irradiation.
- the spacer used here for example, glass fiber, silica beads, polymer beads and the like, and fine particles coated with metal such as gold pearl and silver pearl are used.
- the diameter varies depending on the purpose, but is usually 1 to 100 ⁇ m, preferably 10 to 40 ⁇ m.
- the amount used is usually 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight, and more preferably 1 to 2.5 parts by weight with respect to 100 parts by weight of the sealant.
- the conditions for heat-curing the sealing agent are usually 90 to 180 ° C. and 1 to 3 hours.
- a method of sandwiching with a hot press machine having two hot plates, a method of fixing in a jig, and a method of performing in an oven can be employed.
- a method of sandwiching with a hot press machine having two hot plates, a method of fixing in a jig, and a method of performing in an oven can be employed.
- what is necessary is just to select the irradiation conditions of the ultraviolet-ray in the case of using a ultraviolet curing type and a photothermal combined curing type sealing agent according to the curing rate of a sealing agent.
- the gap between the first and second conductive supports is usually 1 to 100 ⁇ m, preferably 4 to 50 ⁇ m.
- the dye-sensitized solar cell of the present invention can be obtained by injecting the charge transfer layer into the gap between the pair of conductive supports bonded together as described above and then sealing the injection port of the charge transfer layer. it can.
- a sealing agent for sealing the injection port of the charge transfer layer, isobutylene resin, epoxy resin, UV curable acrylic resin, or the like can be used.
- a commercially available sealant can be used as the sealant.
- a UV curable acrylic resin is preferable.
- a method described in International Publication No. WO2007 / 046499 can be employed as another method for producing a dye-sensitized solar cell.
- a sealant weir is provided in the periphery of the conductive surface of one of the conductive supports without providing the charge transfer layer injection port, and then the same charge transfer layer is placed inside the sealant weir.
- the other conductive support is placed and bonded so that the conductive surfaces of the first and second conductive supports face each other under reduced pressure, and at the same time a gap is formed, and then the sealant is cured.
- a dye-sensitized solar cell can be obtained.
- FIG. 1 is a schematic cross-sectional view of the relevant part for explaining the structure of the dye-sensitized solar cell of the present invention.
- 1 is a first conductive support whose inside is conductive
- 2 is a semiconductor-containing layer sensitized with a dye
- 1 and 2 are collectively referred to as an oxide semiconductor electrode.
- 3 is a second conductive support having a counter electrode in which platinum or the like is disposed on a conductive surface inside the conductive support
- 4 is a charge transfer layer disposed in a gap between the pair of conductive supports
- 5 is a sealing agent
- 6 is a glass substrate.
- Electrolyte preparation example 1 0.1M iodine, 0.1M lithium iodide (LiI) as iodide and 1.2M 1-methyl-3-propylimidazolium iodide, and thioester bond and positive charge in the molecule as additive
- Each component was dissolved and mixed in 3-methoxypropionitrile so that a concentration of 0.1 M of butyrylthiocholine iodide, which is a compound having both nitrogen atoms, was obtained, and an electrolyte solution 1 for dye-sensitized solar cells was obtained. Obtained.
- Electrolyte preparation examples 2-15, 17-21 Dye-sensitized solar cell electrolytes 2 to 15 and 17 to 21 were obtained in the same manner as in Electrolyte Preparation Example 1 except that the additives were changed to the compounds shown in Table 1.
- Electrolytic solution preparation example 16 An electrolyte solution 16 for a dye-sensitized solar cell was obtained according to the electrolytic solution preparation example 1 except that the additive butyrylthiocholine iodide was not used.
- Evaluation Test 1 Evaluation of heat stability of electrolyte 1 mL of each of the electrolyte solutions 1 to 21 obtained in the electrolyte solution preparation examples 1 to 21 was added to each of the brown sample bottles and heated in an oven at 85 ° C. for 20 hours in a sealed state. Thereafter, the state of the electrolytic solution was visually observed, and those having no change in the state were evaluated as ⁇ , and those in which the brown color of iodine was decolored, or those in which precipitation occurred in the solution were evaluated as ⁇ . The results are shown in Table 1.
- Evaluation Test 2 Evaluation of heat resistance stability of platinum against electrolyte
- the FTO conductive glass support which is a conductive support
- platinum was vapor-deposited by 50% by sputtering, and cut into a size of 1 cm ⁇ 2 cm was used as a test piece.
- 1 mL of each of electrolytes 1 to 21 and one of the above test pieces were added and heated in an oven at 85 ° C. for 20 hours in a sealed state. Then, the test piece was taken out and the state of platinum was visually observed. The case where there was no change in the state was rated as ⁇ , and the case where the black color of platinum was decolored was marked as x.
- Table 1 The results are shown in Table 1.
- Example 1 On a conductive surface of an FTO conductive glass support, which is a conductive support, TiO 2 fine particles (average particle size 20 nm) made into a paste with terpineol were applied with a screen printer and baked at 450 ° C. for 30 minutes. Then, a conductive support having a semiconductor-containing layer (film thickness: 10 ⁇ m, minor axis width: 5 mm, major axis width: 4 cm) was prepared. The conductive support provided with the obtained semiconductor-containing layer was prepared by applying 1.6 ⁇ 10 ⁇ to the dye described in Example 6 of International Publication No. WO2007 / 100033 (the dye represented by the following formula (3)).
- An oxide semiconductor electrode was produced by immersing in a dye solution obtained by dissolving in acetone to a concentration of 4 M at room temperature for 24 hours. Next, Pt was vapor-deposited on the conductive surface of another FTO conductive glass support to produce a counter electrode.
- a seal obtained by adding 2.5% by mass of gold pearl (pearl diameter: 20 ⁇ m) as a spacer to the epoxy resin-based sealant described in Sealant Preparation Example 3 of International Patent Publication WO2011 / 14551 at the periphery of the obtained counter electrode
- the agent was applied using a screen printer so as to leave the injection port of the charge transfer layer, and then the solvent was removed by heating at 90 ° C. for 18 minutes with a hot air dryer.
- the above oxide semiconductor electrode was overlaid on the sealant so that the conductive surface of the counter electrode and the semiconductor-containing layer face each other, and was heated at 150 ° C. at a pressure of 2.5 kg / cm 2 using a hot press. Was cured for 60 minutes to obtain a cell in which both conductive supports were bonded together.
- the electrolyte solution 1 obtained in the electrolyte preparation example was filled into the cell from the injection port of the obtained cell, and then the injection port was sealed with a UV curable acrylic resin to thereby provide the dye-sensitized solar cell of the present invention. (Battery 1) was obtained.
- Example 2 A dye-sensitized solar cell (battery 2) of the present invention was obtained in the same manner as in Example 1 except that the electrolytic solution 1 was changed to the electrolytic solution 2 obtained in the electrolytic solution preparation example.
- Evaluation test 3 Measurement of initial photoelectric conversion efficiency (initial Eff)
- the photoelectric conversion ability of the batteries 1 and 2 obtained in Examples 1 and 2 and the batteries 3 to 15 obtained in Comparative Examples 1 to 13 was measured.
- a 1 kW xenon lamp manufactured by WACOM
- WACOM photoelectric conversion efficiency
- Eff photoelectric conversion efficiency calculated from the open-circuit voltage, short-circuit current, and form factor is set to 100 mW / cm 2 through an AM1.5 filter, and a solar simulator (WXS-155S). -10, manufactured by WACOM).
- the results are shown in Table 2.
- Evaluation test 4 Heat resistance acceleration test
- the batteries 1 and 2 obtained in Examples 1 and 2 and the batteries 3 to 15 obtained in Comparative Examples 1 to 13 were subjected to a heat resistance acceleration test at 85 ° C.
- the photoelectric conversion efficiency (Eff) after each battery was put in an aluminum bag and held at 85 ° C. for 500 hours was measured according to the test method of Evaluation Test 3. Further, the Eff deterioration rate was calculated by the following equation. The results are shown in Table 2.
- the electrolytic solution containing a compound having both a thioester bond and a positively charged nitrogen atom in the molecule represented by the electrolytic solutions 1 to 3 has good storage stability. Had sex.
- electrolytic solutions containing similar compounds, such as electrolytic solutions 4, 6, and 13 there was a system in which the oxidation-reduction reaction between sulfur atoms and iodine proceeded and the stability was greatly inferior.
- the batteries 1 and 2 of the present invention using the electrolytic solutions 1 and 2 had good initial Eff and Eff after being held at 85 ° C. for 500 hours, and the Eff deterioration rate was about 5%.
- the deterioration rate is greatly inferior to 86%
- the battery 3 using the electrolytic solution 5 to which a compound having only a thioester bond is added The deterioration rate was 83%.
- batteries 4 and 5 using electrolytic solutions 7 and 8 to which a thioamide compound is added, and batteries 6 to 9 using electrolytic solutions 9, 10, 14, 15, 17 and 18 to which a compound containing thiocyanate is added, 11 and 12 etc. the deterioration rate was 18% or more, and the durability of the battery was inferior.
- the batteries 13 to 15 using the electrolytic solutions 19, 20, and 21 to which a compound containing only a positively charged nitrogen atom having no thioester bond in the molecule has a deterioration rate of 99% or more The battery durability was greatly inferior.
- the same desired effect as described above can also be obtained by a dye-sensitized solar cell manufactured using a known non-ruthenium dye other than the compound represented by the formula (3).
- the dye-sensitized solar cell of the present invention using an electrolytic solution containing a compound having both a thioester bond and a positively charged nitrogen atom in the molecule has excellent photoelectric conversion efficiency and heat durability. Obviously it has.
- the sensitizing dye is a non-ruthenium organic dye
- the counter electrode contains platinum
- the charge transfer layer contains iodine, iodine ions, and a nitrogen atom having a thioester bond and a positive charge in the molecule.
- a dye-sensitized solar cell which is an electrolytic solution containing a compound having both has excellent conversion efficiency and high durability. For this reason, it is possible to provide a dye-sensitized solar cell using a non-ruthenium-based dye that has few resource restrictions and a wide range of molecular design, and that has little deterioration even when used for a long period of time.
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Abstract
Description
[1].色素によって増感された半導体含有層を有する第一の導電性支持体、該半導体含有層と対向電極とが所定の間隔で対向する位置に設けられた対向電極を有する第二の導電性支持体、第一及び第二の導電性支持体の間隙に挟持された電荷移動層、並びに、電荷移動層をシールするために第一及び第二の導電性支持体の周辺部に設けられたシール剤を含む色素増感太陽電池であって、該色素が非ルテニウム系の有機色素であり、該対向電極が白金を含み、かつ該電荷移動層が、ヨウ素、ヨウ素イオン、及び分子内にチオエステル結合と正電荷を帯びた窒素原子の双方を有する化合物を含む電解液である色素増感太陽電池。
[2].分子内にチオエステル結合と正電荷を帯びた窒素原子の双方を有する化合物が、下記式(1)
(式中、R1、R2、R3、R4、R5及びR6は、それぞれ独立に、ハロゲン原子、アルコキシ基、エステル基、アシル基、アミノ基、アミド基、アルキル基、アルケニル基、アルキニル基、アリール基、シアノ基、イソシアノ基、ニトロ基、ニトロソ基、ヒドロキシル基、リン酸エステル基、スルフィニル基及びスルホニル基からなる群より選ばれる一種以上の置換基を有していてもよい炭素数1~10の脂肪族炭化水素残基、ハロゲン原子、アルコキシ基、エステル基、アシル基、アミノ基、アミド基、アルキル基、アルケニル基、アルキニル基、アリール基、シアノ基、イソシアノ基、ニトロ基、ニトロソ基、ヒドロキシル基、リン酸エステル基、スルフィニル基及びスルホニル基からなる群より選ばれる一種以上の置換基を有していてもよい芳香族炭化水素残基、ハロゲン原子、アルコキシ基、エステル基、アシル基、アミノ基、アミド基、アルキル基、アルケニル基、アルキニル基、アリール基、シアノ基、イソシアノ基、ニトロ基、ニトロソ基、ヒドロキシル基、リン酸エステル基、スルフィニル基及びスルホニル基からなる群より選ばれる一種以上の置換基を有していてもよい複素環残基若しくは水素原子を表す。また、R1、R2、R3、R4、R5及びR6から選択される任意の2者は結合して環を形成してもよい。nは1~6の整数を表す。Y-は、1価の陰イオンを表す。)
で表される構造を有する上記[1]項に記載の色素増感太陽電池。
[3].式(1)で表される化合物が、チオコリン残基を有する化合物である上記[2]項に記載の色素増感太陽電池。
[4].式(1)で表される化合物が、ハロゲン化物イオンを有する化合物である上記[2]又は[3]項に記載の色素増感太陽電池。
[5].シール剤が、エポキシ樹脂系シール剤である上記[1]項に記載の色素増感太陽電池。
[6].半導体含有層の半導体が、微粒子状の酸化チタン又は微粒子状の複合酸化チタンである上記[1]項に記載の色素増感太陽電池。
[7].非ルテニウム系の有機色素が、下記式(2)
(式中、A1およびA2は、それぞれ独立に、カルボキシル基、シアノ基、アルコキシカルボニル基、アシル基、ニトロ基、環式炭化水素残基、複素環残基、アミノ基、ヒドロキシル基、水素原子、ハロゲン原子又はアルキル基を表す。Xは芳香族炭化水素残基、複素環残基またはアミノ基を表す。mは1~6の整数を表す。また、mが2以上で、A1およびA2が複数存在する場合、それぞれのA1およびそれぞれのA2は互いに独立に同じ又は異なってもよい前記の基を表す。また、A1若しくはA1が複数存在する場合にはそれぞれのA1、A2若しくはA2が複数存在する場合にはそれぞれのA2及びXの中の任意の2者は結合して環を形成してもよい。)
で表される構造を有する上記[1]項に記載の色素増感太陽電池。
[8].式(2)におけるA1が、シアノ基またはカルボキシル基である上記[7]項に記載の色素増感太陽電池。
[9].式(2)におけるXがトリフェニルアミン誘導体を有する(ポリ)エテニル基又は(ポリ)チオフェニル基である上記[7]又は[8]項に記載の色素増感太陽電池。
本発明の色素増感太陽電池は、色素によって増感された半導体含有層を有する第一の導電性支持体、該半導体含有層と対向電極とが所定の間隔で対向する位置に設けられた対向電極を有する第二の導電性支持体、第一及び第二の導電性支持体の間隙に挟持された電荷移動層、並びに電荷移動層をシールするために第一及び第二の導電性支持体の周辺部に設けられたシール剤を含む色素増感太陽電池であって、該色素が非ルテニウム系の有機色素であり、該対向電極が白金を有し、かつ該電荷移動層が、ヨウ素、ヨウ素イオン、及び分子内にチオエステル結合と正電荷を帯びた窒素原子の双方を有する化合物を含む電解液であることを特徴とする。
導電性支持体としては、例えばFTO(フッ素ドープ酸化スズ)、ATO(アンチモンドープ酸化スズ)、ITO(インジウムドープ酸化スズ)に代表される導電性物質を、ガラス、プラスチック、ポリマーフィルム、石英、シリコン等の基板の表面に薄膜化させたものが用いられる。基板の厚みは、通常0.01~10mmである。基板の形状はフィルム状から板状まで様々な態様を取り得るが、第一及び第二の導電性支持体のうち少なくとも一方には、光透過性のある基板が用いられる。導電性支持体の抵抗値は通常1000Ω/cm2以下、好ましくは100Ω/cm2以下である。
式(2)におけるA1及びA2が表すアルコキシカルボニル基が有するアルキル基としては、置換基を有してもよい飽和又は不飽和の直鎖状、分岐鎖状又は環状のアルキル基が挙げられる。直鎖状又は分岐鎖状のアルキル基としては、炭素数1~36のアルキル基が好ましく、より好ましくは飽和の炭素数1~20の直鎖状アルキル基である。環状のものとしては、例えば炭素数3~8のシクロアルキル基などが挙げられる。
式(2)におけるA1及びA2が表すアシル基としては、炭素数1~10のアルキルカルボニル基、アリールカルボニル基等が挙げられ、好ましくは炭素数1~4のアルキルカルボニル基、具体的にはアセチル基、プロピオニル基等が挙げられる。
A1及びA2が表す環式炭化水素残基は置換基を有していてもよく、該置換基としては、例えばアルキル基、アリール基、シアノ基、イソシアノ基、チオシアネート基、イソチオシアナト基、ニトロ基、ニトロシル基、アシル基、ハロゲン原子、ヒドロキシル基、リン酸基、リン酸エステル基、置換若しくは非置換メルカプト基、置換若しくは非置換アミノ基、置換若しくは非置換アミド基、アルコキシ基、アルコキシアルキル基、カルボキシル基、アルコキシカルボニル基、スルホ基等が挙げられる。ここでいうアルキル基としては、上記したアルコキシカルボニル基が有するアルキル基と同じものが挙げられる。アシル基としては上記したのと同じものが挙げられ、また、アリール(aryl)基としては上記した環式炭化水素残基の項で挙げた芳香環から水素原子をとった基等が挙げられる。アリール基は更に置換基を有していてもよく、該置換基としては上記した環式炭化水素残基が有していてもよい置換基と同じものが挙げられる。ハロゲン原子としては、塩素、臭素、ヨウ素等の原子が挙げられる。リン酸エステル基としては、リン酸(炭素数1~4)アルキルエステル基などが挙げられる。置換若しくは非置換メルカプト基としては、メルカプト基、アルキルメルカプト基などが挙げられる。置換若しくは非置換アミノ基としては、アミノ基、モノ又はジアルキルアミノ基、モノ又はジ芳香族アミノ基などが挙げられる。具体的には、モノ又はジメチルアミノ基、モノ又はジエチルアミノ基、モノ又はジプロピルアミノ基、モノ又はジフェニルアミノ基並びにモノ又はジベンジルアミノ基等が挙げられる。置換若しくは非置換アミド基としては、アミド基、アルキルアミド基、芳香族アミド基等が挙げられる。アルコキシ基としては、例えば炭素数1~10のアルコキシ基などが挙げられる。アルコキシアルキル基としては、例えば(炭素数1~10)アルコキシ(炭素数1~4)アルキル基などを挙げることができる。アルコキシカルボニル基としては、例えば炭素数1~10のアルコキシカルボニル基などが挙げられる。またカルボキシル基、スルホ基およびリン酸基等の酸性基は、リチウム、ナトリウム、カリウム、マグネシウム、カルシウムなどの金属塩や、テトラメチルアンモニウム、テトラブチルアンモニウム、ピリジニウム、イミダゾリウムなどの4級アンモニウム塩のような塩を形成していても良い。
A1及びA2が表す複素環残基の好ましいものとしては、例えばピリジン環、ピラジン環、ピペリジン環、モルホリン環、インドリン環、チオフェン環、フラン環、オキサゾール環、チアゾール環、インドール環、ベンゾチアゾール環、ベンゾオキサゾール環、ピラジン環、キノリン環等の複素環式化合物から水素原子を1つ除いた基が挙げられる。
式(2)におけるA1とA2が表すハロゲン原子としては、上記したのと同じものが挙げられる。
式(2)におけるA1とA2が表すアルキル基としては、上記したアルコキシカルボニル基が有するアルキル基と同じものが挙げられる。該アルキル基は置換基を有していてもよい。アルキル基が有していてもよい置換基としては、アリール基、ハロゲン原子、アルコキシ基等が挙げられる。ここでいうアリール基及びハロゲン原子としては、上記したのと同じものが、またアルコキシ基が有するアルキル基としては、上記したアルコキシカルボニル基が有するアルキル基と同じものが挙げられる。
式(2)におけるmは1~6の整数を表す。
式(2)におけるXが表すアミノ基は置換基を有していてもよい。置換基を有していてもよいアミノ基の具体例としては、アミノ基、ジフェニルアミノ基、モノフェニルアミノ基、ジアルキルアミノ基、モノアルキルアミノ基、アルキルフェニルアミノ基、アルコキシアミノ基、アシルアミノ基(例えばベンゾイルアミノ基、アセチルアミノ基等)などが挙げられる。これらアミノ基が有するアルキル基、アルコキシ基、アシル基等は、上記したのと同じものが挙げられる。
第二の導電性支持体には、前記第一の導電性支持体に用いられるのと同様の導電性支持体の表面に、対向電極として酸化還元系電解質の還元反応に触媒的に作用する白金を蒸着したものや、白金を含む金属の微粒子、または白金を含む金属微粒子の前駆体等を塗布、焼成したものが用いられる。
式(1)におけるnは1~6の整数を表す。nは、好ましくは1~4の整数、より好ましくは1~3の整数である。
ヨウ素を0.1M、ヨウ化物としてリチウムヨーダイド(LiI)を0.1Mと1-メチル-3-プロピルイミダゾリウムヨーダイドを1.2M、添加剤として分子内にチオエステル結合と正電荷を帯びた窒素原子の双方を有する化合物であるブチリルチオコリンヨージドを0.1Mの濃度になるように、各成分を3-メトキシプロピオニトリルに溶解混合させて、色素増感太陽電池用電解液1を得た。
添加剤を表1に示した各化合物に変更したこと以外は電解液作成例1に準じて、色素増感太陽電池用電解液2~15、17~21をそれぞれ得た。
添加剤であるブチリルチオコリンヨージドを用いなかったこと以外は電解液作成例1に準じて、色素増感太陽電池用電解液16を得た。
電解液作成例1~21で得られた電解液1~21を、褐色のサンプル瓶中にそれぞれ1mLずつ加え、密閉した状態で85℃の乾燥機中で20時間加熱した。その後、電解液の状態を目視で観察し、状態に変化が無いものを○とし、ヨウ素の褐色が消色しているもの、または液中に沈殿が発生しているものを×とした。結果を表1に示した。
導電性支持体であるFTO導電性ガラス支持体の導電面上に、スパッタリングにより白金を50Å蒸着し、1cm×2cmのサイズに切り出したものを試験片とした。褐色のサンプル瓶中に、電解液1~21をそれぞれ1mLずつと、上記の試験片を1枚ずつ加え、密閉した状態で85℃の乾燥機中で20時間加熱した。その後、試験片を取り出し、白金の状態を目視で観察して、状態に変化が無いものを○とし、白金の黒色が消色しているものを×とした。結果を表1に示した。
導電性支持体であるFTO導電性ガラス支持体の導電面上に、TiO2微粒子(平均粒子径20nm)をターピネオールでペースト状にしたものをスクリーン印刷機で塗布して、450℃で30分間焼成し、半導体含有層(膜厚10μm 短軸幅5mm 長軸幅4cm)を有する導電性支持体を作成した。得られた半導体含有層の設けられた導電性支持体を、国際公開特許WO2007/100033号公報の実施例6に記載の色素(下記式(3)で示される色素)を1.6×10-4Mの濃度になるようにアセトンに溶解して得られた色素溶液に、室温で24時間浸漬して酸化物半導体電極を作製した。次に、別のFTO導電性ガラス支持体の導電面上にPtを50Å蒸着させて対向電極を作製した。得られた対向電極の周縁部に、国際公開特許WO2011/14551公報のシール剤作製例3に記載のエポキシ樹脂系シール剤にスペーサーとして金パール(パール径20μm)を2.5質量%添加したシール剤を、電荷移動層の注入口を残すようにスクリーン印刷機を用いて塗布した後、温風乾燥機で90℃、18分間加熱して溶剤を除去した。その後、前記した酸化物半導体電極を、対向電極の導電面と半導体含有層とが対面するようにシール剤上に重ね合わせ、熱プレス機を用いて2.5kg/cm2の圧力で、150℃で60分間硬化させることにより、両導電性支持体を貼り合わせたセルを得た。得られたセルの注入口から電解液作成例で得られた電解液1をセル内に充填した後、注入口をUV硬化性アクリル系樹脂で封止することにより本発明の色素増感太陽電池(電池1)を得た。
電解液1を電解液作成例で得られた電解液2に変更したこと以外は実施例1に準じて、本発明の色素増感太陽電池(電池2)を得た。
電解液1を電解液作成例で得られた電解液5、7~10、14~21に変更したこと以外は実施例1に準じて、比較用の色素増感太陽電池(電池3~15)をそれぞれ得た。
実施例1、2で得られた電池1、2、比較例1~13で得られた電池3~15について、光電変換能の測定を行った。光源には1kWキセノンランプ(WACOM製)を用いて、AM1.5フィルターを通して100mW/cm2とし、開放電圧、短絡電流、形状因子から算出される光電変換効率(Eff)をソーラシミュレータ(WXS-155S-10、WACOM製)を用いて測定した。結果を表2に示した。
実施例1、2で得られた電池1、2、比較例1~13で得られた電池3~15について、85℃の耐熱加速試験を実施した。それぞれの電池をアルミ製の袋に入れ、85℃で500時間保持した後の光電変換効率(Eff)を、評価試験3の試験方法に準じて測定した。また、以下の式によりEff劣化率を算出した。結果を表2に示した。
100×[(初期Eff-85℃500時間後Eff)/(初期Eff)]
2 色素によって増感された半導体含有層
3 対向電極
4 電荷移動層
5 シール剤
6 ガラス基板
Claims (9)
- 色素によって増感された半導体含有層を有する第一の導電性支持体、該半導体含有層と対向電極とが所定の間隔で対向する位置に設けられた対向電極を有する第二の導電性支持体、第一及び第二の導電性支持体の間隙に挟持された電荷移動層、並びに電荷移動層をシールするために第一及び第二の導電性支持体の周辺部に設けられたシール剤を含む色素増感太陽電池であって、該色素が非ルテニウム系の有機色素であり、該対向電極が白金を含み、かつ該電荷移動層が、ヨウ素、ヨウ素イオン、及び分子内にチオエステル結合と正電荷を帯びた窒素原子の双方を有する化合物を含む電解液である色素増感太陽電池。
- 分子内にチオエステル結合と正電荷を帯びた窒素原子の双方を有する化合物が、下記式(1)
(式中、R1、R2、R3、R4、R5及びR6は、それぞれ独立に、ハロゲン原子、アルコキシ基、エステル基、アシル基、アミノ基、アミド基、アルキル基、アルケニル基、アルキニル基、アリール基、シアノ基、イソシアノ基、ニトロ基、ニトロソ基、ヒドロキシル基、リン酸エステル基、スルフィニル基及びスルホニル基からなる群より選ばれる一種以上の置換基を有していてもよい炭素数1~10の脂肪族炭化水素残基、ハロゲン原子、アルコキシ基、エステル基、アシル基、アミノ基、アミド基、アルキル基、アルケニル基、アルキニル基、アリール基、シアノ基、イソシアノ基、ニトロ基、ニトロソ基、ヒドロキシル基、リン酸エステル基、スルフィニル基及びスルホニル基からなる群より選ばれる一種以上の置換基を有していてもよい芳香族炭化水素残基、ハロゲン原子、アルコキシ基、エステル基、アシル基、アミノ基、アミド基、アルキル基、アルケニル基、アルキニル基、アリール基、シアノ基、イソシアノ基、ニトロ基、ニトロソ基、ヒドロキシル基、リン酸エステル基、スルフィニル基及びスルホニル基からなる群より選ばれる一種以上の置換基を有していてもよい複素環残基若しくは水素原子を表す。また、R1、R2、R3、R4、R5及びR6から選択される任意の2者は結合して環を形成してもよい。nは1~6の整数を表す。Y-は、1価の陰イオンを表す。)
で表される構造を有する請求項1に記載の色素増感太陽電池。 - 式(1)で表される化合物が、チオコリン残基を有する化合物である請求項2に記載の色素増感太陽電池。
- 式(1)で表される化合物が、ハロゲン化物イオンを有する化合物である請求項2または3に記載の色素増感太陽電池。
- シール剤が、エポキシ樹脂系シール剤である請求項1に記載の色素増感太陽電池。
- 半導体含有層の半導体が、微粒子状の酸化チタン又は微粒子状の複合酸化チタンである請求項1に記載の色素増感太陽電池。
- 非ルテニウム系の有機色素が、下記式(2)
(式中、A1およびA2は、それぞれ独立に、カルボキシル基、シアノ基、アルコキシカルボニル基、アシル基、ニトロ基、環式炭化水素残基、複素環残基、アミノ基、ヒドロキシル基、水素原子、ハロゲン原子又はアルキル基を表す。Xは芳香族炭化水素残基、複素環残基またはアミノ基を表す。mは1~6の整数を表す。また、mが2以上で、A1およびA2が複数存在する場合、それぞれのA1およびそれぞれのA2は互いに独立に同じ又は異なってもよい前記の基を表す。また、A1若しくはA1が複数存在する場合にはそれぞれのA1、A2若しくはA2が複数存在する場合にはそれぞれのA2及びXの中の任意の2者は結合して環を形成してもよい。)
で表される構造を有する請求項1に記載の色素増感太陽電池。 - 式(2)におけるA1が、シアノ基またはカルボキシル基である請求項7に記載の色素増感太陽電池。
- 式(2)におけるXが、トリフェニルアミン誘導体を有する(ポリ)エテニル基又は(ポリ)チオフェニル基である請求項7または8に記載の色素増感太陽電池。
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EP2928009A4 (en) | 2016-08-24 |
EP2928009A1 (en) | 2015-10-07 |
CN104823254A (zh) | 2015-08-05 |
JPWO2014084296A1 (ja) | 2017-01-05 |
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